L4virtio::Svr::Block_request< Ds_data > Class Template Reference

A request to read or write data. More...

#include <virtio-block>

Collaboration diagram for L4virtio::Svr::Block_request< Ds_data >:

Public Member Functions
unsigned	data_size () const
	Compute the total size of the data in the request.
bool	has_more ()
	Check if the request contains more data blocks.
Data_block	next_block ()
	Return next block in scatter-gather list.
l4virtio_block_header_t const &	header () const
	Return the block request header.

Detailed Description

template<typename Ds_data>
class L4virtio::Svr::Block_request< Ds_data >

A request to read or write data.

Definition at line 28 of file virtio-block.

Member Function Documentation

data_size()

template<typename Ds_data >

unsigned L4virtio::Svr::Block_request< Ds_data >::data_size ( ) const

inline

Compute the total size of the data in the request.

Return values

Size	in bytes or 0 if there was an error.

Exceptions

L4::Runtime_error(-L4_EIO)

Request has a bad format.

Note that this operation is relatively expensive as it has to iterate over the complete list of blocks.

Definition at line 63 of file virtio-block.

References L4virtio::Svr::Request_processor::has_more(), L4_EIO, L4virtio::Svr::Request_processor::next(), and L4virtio::Svr::Request_processor::start().

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next_block()

template<typename Ds_data >

Data_block L4virtio::Svr::Block_request< Ds_data >::next_block ( )

inline

Return next block in scatter-gather list.

Returns

Information about the next data block.

Exceptions

L4::Runtime_error	No more data block is available.
Bad_descriptor	Virtio request is corrupted.

Definition at line 113 of file virtio-block.

References L4virtio::Svr::Bad_descriptor::Bad_size, L4virtio::Svr::Request_processor::has_more(), L4_EEXIST, and L4virtio::Svr::Request_processor::next().

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The documentation for this class was generated from the following file:

• l4/l4virtio/server/virtio-block